#include<stdio.h>
int main()
{ 
    int age(int n);
    printf("NO.5, age:%d\n", age(5));
    return 0;
}
int age(int n)
{ 
    int c;
    if(n==1)
        c=10;
    else
        c=age(n-1)+2;
    return(c);
}